Chopsticks for beginners come with a metalspring for easier use.
专为初学者设计的筷子，中间有弹簧夹，用起来更方便。
2
Plant is mainly used for metal screws, metal crafts factory, metalspring factory, electronics factory, toy factory, the watch factory and so on!
主要用于五金螺丝厂、五金工艺品厂、五金弹簧厂、电子厂、玩具厂、表业制造厂等！
3
The peg was made of plastic and metalspring was abandoned. By altering mixture of plastic raw material, folding capability of plastic parts was improved.